CN104683798A - Miracast image encoding method and device thereof and Miracast image decoding method and device thereof - Google Patents
Miracast image encoding method and device thereof and Miracast image decoding method and device thereof Download PDFInfo
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Abstract
The invention provides a Miracast image encoding method and a device thereof and a Miracast image decoding method and a device thereof. The Miracast image encoding method comprises the following steps: sampling a current frame stored in a buffer; judging whether or not the difference degree between the current frame and a previous frame prior to the current frame is higher than a preset threshold value; if the difference degree between the current frame and the previous frame prior to the current frame is not higher than the preset threshold value, recording a difference block between the current frame and the previous frame and the position information of the difference block; and transmitting the difference block and the position information of the difference block to the Miracast image decoding device through directly-connected image channels.
Description
Technical field
The invention relates to a kind of video encoding method and device thereof and image decoding method and device thereof, and relate to a kind of mirror video encoding method and device thereof and mirror image decoding method and device thereof especially.
Background technology
Along with the development of science and technology and the evolution in epoch, the amusement function that people provide for electronic product is more and more focused on.Therefore, Ge Jia manufacturer falls over each other the digital entertainment product releasing various novelty invariably, to attract the attention of consumers.The picture watched on the mobile device can be projected to the display had compared with large-screen to allow user, develop the external device (ED) that one has screen mirror (Miracast) function now, it can after being connected with mobile device, data sent according to mobile device and control display (such as TV) the display picture identical with mobile device accordingly.
But, when the data of described external device (ED) are delivered in the tendency to develop of mobile device coding, mobile device and external device (ED) may be made when providing screen mirror function to occur the situation postponed because used coding standard specification need be met.For example, suppose that H.264 the coding standard that mobile device uses is, then, after mobile device need first collect the frame of some, encoding mechanism H.264 can be carried out in the lump.Further, in order to be decoded by the frame of encoding to these, the decoding that described external device (ED) also needs the frame collecting respective amount can carry out H.264 is machine-processed.Thus, mobile device and external device (ED) may make the picture shown by display occur the phenomenon that the users such as pause, delay are subject to more unbearably for the time of collecting frame.
Summary of the invention
In view of this, the invention provides a kind of mirror video encoding method and device thereof, its screen mirror can effectively avoiding the overlong time because collecting frame to cause postpones situation.In addition, the present invention also provides a kind of mirror image decoding method and device thereof, and it can perform different functions accordingly in response to the data transmitted in mirror image coding device, and then effectively promotes the efficiency of decoding.
The invention provides a kind of mirror video encoding method, be suitable for mirror image coding device code and share picture to mirror image-decoding device.Described method comprises the following steps: to sample the present frame be stored in buffer; Judge present frame and prior to present frame previous frame between diversity factor whether higher than predetermined threshold value; If not, at least one difference block between record present frame and previous frame and at least one positional information of at least one difference block; At least one positional information of at least one difference block and at least one difference block is sent to mirror image-decoding device by the image processing channels of direct line.
In one embodiment of this invention, at least one difference block comprises at least one block of pixels different between present frame and previous frame, and described at least one positional information comprises at least one block of pixels coordinate information in the current frame and dimension information.
In one embodiment of this invention, judge present frame and prior to present frame previous frame between the step of diversity factor whether higher than predetermined threshold value after, more comprise: when diversity factor is higher than predetermined threshold value, the multiple temporary frame adopting H.264 encoding mechanism coding present frame and be stored in buffer; Present frame after coding and described multiple temporary frame are carried out multiplex (MUX) with corresponding audio-frequency unit and processes to produce transmission stream; Transmission stream is sent to mirror image-decoding device by the serial flow passage of direct line.
In one embodiment of this invention, direct line comprises the direct line of wireless fidelity.
The invention provides a kind of mirror image coding device, comprise buffer, communication unit, sampling unit and image process unit.Sampling unit couples buffer, is configured to sample the present frame be stored in buffer.Image process unit couples sampling unit and communication unit, be configured to perform the following step: judge present frame and prior to present frame previous frame between diversity factor whether higher than predetermined threshold value; If not, at least one difference block between record present frame and previous frame and at least one positional information of at least one difference block; Communication control unit sends at least one difference block and described at least one positional information to mirror image-decoding device by the image processing channels of direct line.
In one embodiment of this invention, when diversity factor is higher than predetermined threshold value, the multiple temporary frame that image process unit adopts H.264 encoding mechanism coding present frame and is stored in buffer, and the present frame after coding and described multiple temporary frame are carried out multiplex (MUX) with corresponding audio-frequency unit and process to produce transmission stream, and the serial flow passage transmission transmission stream passing through direct line is to mirror image-decoding device.
The invention provides a kind of mirror image decoding method, be suitable for the picture that mirror image-decoding device decoding mirror image coding device is shared.Described method comprises the following steps: to receive data from mirror image coding device from direct line; Judge that data are image processing channels from direct line or serial flow passage; If data come from image processing channels, according at least one difference block in data and at least one positional information adjustment present frame, wherein at least one positional information corresponds at least one difference block between present frame and previous frame; Control display unit display present frame.
In one embodiment of this invention, at least one difference block comprises at least one block of pixels different between present frame and previous frame, and described at least one positional information comprises at least one block of pixels coordinate information in the current frame and dimension information.
In one embodiment of this invention, judge data be from the image processing channels of direct line or the step of serial flow passage after, more comprise: if data come from serial flow passage, collect the multiple frames that can be used for the mechanism of H.264 decoding, and described multiple frame comprises present frame; Adopt the H.264 described multiple frame of decoding mechanism decoding; Control the decoded described multiple frame of display unit display.
In one embodiment of this invention, direct line comprises the direct line of wireless fidelity.
The invention provides a kind of mirror image-decoding device, comprise communication unit and image process unit.Communication unit is configured to receive data from mirror image coding device from direct line.Image process unit connecting communication unit, is configured to perform the following step: judge that data are image processing channels from direct line or serial flow passage; If data come from image processing channels, according at least one difference block in data and described at least one positional information adjustment present frame, wherein said at least one positional information corresponds at least one difference block between present frame and previous frame; Control display unit display present frame.
In one embodiment of this invention, mirror image-decoding device more comprises the buffer being connected to communication unit and image process unit, if wherein data come from serial flow passage, image process unit is more configured to from buffer, collect the multiple frames that can be used for the mechanism of H.264 decoding, and described multiple frame comprises present frame; Adopt the H.264 described multiple frame of decoding mechanism decoding; Control the decoded described multiple frame of display unit display.
Based on above-mentioned, the mirror video encoding method that the embodiment of the present invention proposes and device thereof can diversity factor between present frame and previous frame not higher than predetermined threshold value time, only difference block and positional information thereof between present frame and previous frame are sent to mirror image-decoding device.In response in the difference block positional information from aforementioned mirror image coding device, the mirror image decoding method that the embodiment of the present invention proposes and device thereof these difference blocks of direct basis and positional information thereof can change the block of pixels of correspondence position on previous frame, and then produce for display present frame on the display apparatus.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate appended accompanying drawing to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the mirror image coding device that foundation one embodiment of the invention illustrate.
Fig. 2 is the mirror video encoding method flow chart illustrated according to one embodiment of the invention.
Fig. 3 is the functional block diagram of the mirror image-decoding device that foundation one embodiment of the invention illustrate.
Fig. 4 illustrates mirror image decoding method flow chart according to one embodiment of the invention.
[description of reference numerals]
100: mirror image coding device
110,340: buffer
120: sampling unit
130,320: image process unit
140,310: communication unit
300: mirror image-decoding device
330: display unit
S210 ~ S270, S410 ~ S470: step
Embodiment
Fig. 1 is the functional block diagram of the mirror image coding device that foundation one embodiment of the invention illustrate.In the present embodiment, mirror image coding device 100 comprises buffer 110, sampling unit 120, image process unit 130 and communication unit 140.Mirror image coding device 100 is such as intelligent mobile phone (Smart Phone), panel computer (Tablet), notebook computer, personal digital assistant or other any by Radio Transmission Technology by play picture transmission or share to other devices, to reach the electronic installation of screen mirror (Miracast) function.Described Radio Transmission Technology is such as the direct line of wireless fidelity (Wireless Fidelity direct, Wi-Fi direct), but embodiment of the present invention is not limited thereto.Buffer 110 is such as the Storage Medias such as memory, and it can store the multiple frames (frame) being associated with picture shown by mirror image coding device 100.Sampling unit 120 couples buffer 110, can be configured to sample each frame be stored in buffer 110.In one embodiment, when image process unit 130 is when encoding for screen mirror image according to such as image standard H.264, the frame that image process unit 130 need collect some can carry out based on image coding mechanism H.264, and these frames all can be temporary in buffer 110.
Image process unit 130 is coupled to sampling unit 120, it can be graphics processing unit (Graphics Processing Unit, GPU), general service processor, special purpose processors, traditional processor, digital signal processor, multi-microprocessor (microprocessor), the microprocessor of one or more combined digital signal processor core, controller, microcontroller, Application Specific Integrated Circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array circuit (Field Programmable Gate Array, FPGA), the integrated circuit of any other kind, state machine, based on advanced reduced instruction set machine (Advanced RISC Machine, ARM) processor and similar product.
Communication unit 140 couples image process unit 130, its can with such as Set Top Box (Set-Top Box, etc. STB) mirror image-decoding device sets up direct line (being such as the direct line of Wi-Fi), and the frame of image process unit 130 being encoded by this direct line or other relevant image informations transfer to described mirror image-decoding device.
In order to avoid mirror image coding device 100 occurs when carrying out screen mirror mechanism with mirror image-decoding device the phenomenon that picture postpones, the embodiment of the present invention proposes a kind of mirror video encoding method, its can diversity factor between the frame of two, front and back little time, reduce the information that is sent to mirror image-decoding device and to decode the efficiency of image to improve mirror image-decoding device.
Fig. 2 is the mirror video encoding method flow chart illustrated according to one embodiment of the invention.The method that the present embodiment proposes can be performed by the mirror image coding device 100 of Fig. 1, and then the picture (that is, frame) shared to mirror image-decoding device of encoding, and each element of the Fig. 1 that namely arranges in pairs or groups below is to illustrate the step details of this method.
In step S210, sampling unit 120 sampling is stored in the present frame in buffer 110.Then, in step S220, image process unit 130 can judge present frame and prior to present frame previous frame between diversity factor whether higher than predetermined threshold value.Described previous frame is one of multiple temporary frame being stored in buffer 110 before described present frame such as, and described predetermined threshold value is such as 5% or any ratio value by designer's sets itself.
Specifically, image process unit 130 can take out a temporary frame (being such as the former frame of described present frame) previously stored from buffer 110, and finds out block of pixels different between this frame and described present frame.Then, image process unit 130 can calculate the ratio between the gross area of these different block of pixels and the area of whole present frame, and characterizes described diversity factor by this ratio.In one embodiment, each block of pixels can comprise single pixel or multiple continuous print pixel, but the present invention can be not limited thereto.
If described diversity factor is higher than described predetermined threshold value, then in step S230, the multiple temporary frame that image process unit 130 can adopt H.264 encoding mechanism coding present frame and be stored in buffer.Further, in step S240, the present frame after coding and described multiple temporary frame can be carried out multiplex (MUX) with corresponding audio-frequency unit and process to produce transmission stream (Transport Stream, TS) by image process unit 130.Afterwards, in step s 250, image process unit 130 can control communication unit 140 and send transmission stream to mirror image-decoding device by the serial flow passage (stream channel) of direct line.
On the other hand, if described diversity factor is not higher than described predetermined threshold value, in step S260, image process unit 130 can record difference block between present frame and previous frame and positional information thereof.Described difference block is such as the region of block of pixels different between described present frame and described previous frame, and described positional information then such as comprises the coordinate information of these difference blocks in described present frame and dimension information.In one embodiment, because the difference block between described present frame and previous frame likely comprises individually multiple neighbouring and/or pixel that left and right is adjacent, when these adjacent combination of pixels go out rectangular difference block, for each rectangular difference block, image process unit 130 only can record the coordinate of the pixel being positioned at corner and the size of whole difference block, using the positional information as this difference block.
In one embodiment, after step S260, image process unit 130 more can judge whether the data volume of described difference block and positional information sum total thereof is greater than default compression threshold value (being such as 1MB).If so, described difference block and positional information thereof can compress by image process unit 130; If not, image shadow processing unit 130 can not compress described difference block and positional information thereof.
Afterwards, in step S270, image process unit 130 can control communication unit 140 and send (after compression) difference block and positional information thereof to mirror image-decoding device by the image processing channels (image channel) of direct line.Described image processing channels is such as the logical channel different from described serial flow passage, it can realize by setting up between mirror image coding device 100 with mirror image-decoding device the corresponding mode being socketed interface (socket), but embodiment of the present invention is not limited thereto.
In other words, when image process unit 130 judges that diversity factor between present frame and previous frame is not higher than predetermined threshold value, difference block and positional information thereof between present frame and previous frame only can be sent to mirror image-decoding device by image process unit 130, and just carry out encoding mechanism H.264 after not needing to wait for the frame collecting sufficient amount.Thus, the code efficiency of mirror image coding device 100 can improve effectively.Specifically, when the diversity factor between present frame and previous frame is little, mirror image coding device 100 can save lower collection for carrying out the time of the frame of H.264 encoding mechanism, and then the screen mirror avoiding the overlong time because collecting frame to cause postpones situation.In addition, when the diversity factor between present frame and previous frame is little, owing to not needing that difference block and positional information thereof are carried out multiplex's process with corresponding audio-frequency unit, thus can be considered the time of also having saved and having carried out multiplex's process.
In response to the difference block transmitted in mirror image coding device 100 and positional information thereof or transmission stream, described mirror image-decoding device performs different functions to process the data received from mirror image coding device 100 with may correspond to, and its details is as follows.
Fig. 3 is the functional block diagram of the mirror image-decoding device that foundation one embodiment of the invention illustrate.In the present embodiment, mirror image-decoding device 300 comprises communication unit 310 and image process unit 320.Mirror image-decoding device 300 is such as Set Top Box or other after receiving the data that mirror image-decoding device 100 transmit, can control display unit 330 and show the electronic installation with mirror image-decoding device 100 same frame accordingly.
Communication unit 310 is such as the communication element similar in appearance to communication unit 140 shown in Fig. 1.Communication unit 310 can set up direct line with communication unit 140, and from then on directly line receive the data (being such as difference block and positional information thereof or transmission stream) from mirror image coding device 100.Image process unit 320 is coupled to communication unit 310, and it can also be graphics processing unit or other processors similar in appearance to processing unit 130 shown in Fig. 1.
Display unit 330 is connected to mirror image-decoding device 300 by the interface of such as high-resolution multimedia interface (High-Definition Multimedia Interface, HDMI), but embodiment of the present invention is not limited thereto.Display unit 330 can be liquid crystal display (Liquid Crystal Display, LCD), thin-film transistor (TFT)-LCD, Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED), flexible display, three-dimensional (3D) display or its fellow.
In the present embodiment, mirror image-decoding device 300 more can comprise the buffer 340 being coupled to communication unit 310 and image process unit 320.Buffer 340 is such as that memory etc. can be used for the temporary Storage Media coming from the frame of mirror image coding device 100, but embodiment of the present invention is not limited thereto.
Fig. 4 illustrates mirror image decoding method flow chart according to one embodiment of the invention.The method that the present embodiment proposes can be performed by the mirror image-decoding device 300 of Fig. 3, and then the picture that decoding mirror image coding device 100 is shared, and each element of the Fig. 3 that namely arranges in pairs or groups below is to illustrate the step details of this method.
In step S410, communication unit 310 can from the data of direct line reception from mirror image coding device 100.Further, in the step s 420, image process unit 320 can judge that data are image processing channels from direct line or serial flow passage.
Corresponding to institute's teaching in preceding embodiment, if image process unit 320 judges that described data come from serial flow passage, namely this represent received data is transmission streams, and therefore image process unit 320 can continue and carry out step S430 to collect the multiple frames that can be used for the mechanism of H.264 decoding.Then, in step S440, image process unit 440 can adopt the H.264 multiple frame of decoding mechanism decoding.Further, in step S450, image process unit 320 can control display unit 330 and show decoded multiple frame.
On the other hand, if image process unit 320 judges that described data come from image processing channels, namely this represent received data is difference block and positional informations thereof between two frames.
In one embodiment, image process unit 320 first can judge whether described data are compressed.If so, then image process unit 320 can first decompress to described data, and continues and carry out step S460.If not, then image process unit 320 directly can carry out step S460.
In step S460, image process unit 320 according to the difference block in data and positional information adjustment present frame thereof, and in step S470, can control display unit 330 and shows present frame.
In other words, when image process unit 320 judge from the data of mirror image coding device 100 be only difference block and positional information time, image process unit 320 gets final product the block of pixels of correspondence position on these positional informations of direct basis change previous frame, and then produces for being presented at the present frame in display unit 330.From another viewpoint, image process unit 320 except do not need to wait for collect sufficient amount frame after just carry out H.264 decoding mechanism, also do not need such as to separate the process such as multiplex (MUX) (demultiplex) to described data.Thus, the decoding efficiency of mirror image-decoding device 300 can improve effectively.Specifically, when the diversity factor between present frame and previous frame is little, mirror image-decoding device 300 can save the time of lower collection for the frame of the mechanism of H.264 decoding, and then the screen mirror avoiding the overlong time because collecting frame to cause postpones situation.In addition, owing to not needing to carry out the process such as solution multiplex (MUX) to described data, thus can be considered the time of additionally having saved for carrying out separating multiplex's process.
In sum, the mirror video encoding method that the embodiment of the present invention proposes and device thereof can diversity factor between present frame and previous frame not higher than predetermined threshold value time, only difference block and positional information thereof between present frame and previous frame are sent to mirror image-decoding device, and just carry out encoding mechanism H.264 after not needing to wait for the frame collecting sufficient amount.In addition, owing to not needing that difference block and positional information thereof are carried out multiplex's process with corresponding audio-frequency unit, thus can be considered the time of also having saved and having carried out multiplex's process.Thus, the code efficiency of mirror image coding device can improve effectively.
In response in from the difference block of aforementioned mirror image coding device and positional information thereof, the mirror image decoding method that the embodiment of the present invention proposes and device thereof these positional informations of direct basis can change the block of pixels of correspondence position on previous frame, and then produce for display present frame on the display apparatus.Therefore, mirror image-decoding device just carries out decoding mechanism H.264 after not needing to wait for the frame collecting sufficient amount equally, and does not also need to carry out the process such as solution multiplex (MUX), and then its decoding efficiency is improved accordingly.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; have in any art and usually know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (12)
1. a mirror video encoding method, be suitable for mirror image coding device code and share picture to mirror image-decoding device, it is characterized in that, described method comprises the following steps:
Sample the present frame be stored in buffer;
Judge this present frame and prior to this present frame previous frame between diversity factor whether higher than predetermined threshold value;
If not, at least one positional information of at least one difference block between this present frame and this previous frame and this at least one difference block is recorded; And
This at least one positional information of this at least one difference block and this at least one difference block is sent to this mirror image-decoding device by the image processing channels of direct line.
2. the method for claim 1, it is characterized in that, this at least one difference block comprises at least one block of pixels different between this present frame and this previous frame, and this at least one positional information comprises the coordinate information of this at least one block of pixels in this prior in frame and dimension information.
3. the method for claim 1, is characterized in that, judge this present frame and prior to this present frame this previous frame between the step of this diversity factor whether higher than this predetermined threshold value after, more comprise:
When this diversity factor is higher than this predetermined threshold value, H.264 encoding mechanism is adopted to encode this present frame and the multiple temporary frame that is stored in this buffer;
This present frame after coding and the plurality of temporary frame are carried out multiplex (MUX) with corresponding audio-frequency unit and processes to produce transmission stream; And
This transmission stream is sent to this mirror image-decoding device by the serial flow passage of this direct line.
4. a mirror image coding device, is characterized in that, comprising:
Buffer;
Communication unit;
Sampling unit, couples this buffer, is configured to sample the present frame be stored in this buffer; And
Image process unit, couples this sampling unit and this communication unit, is configured to perform the following step:
Judge this present frame and prior to this present frame previous frame between diversity factor whether higher than predetermined threshold value;
If not, at least one positional information of at least one difference block between this present frame and this previous frame and this at least one difference block is recorded; And
Control this communication unit and send this at least one positional information of this at least one difference block and this at least one difference block to mirror image-decoding device by the image processing channels of direct line.
5. mirror image coding device as claimed in claim 4, it is characterized in that, this at least one difference block comprises at least one block of pixels different between this present frame and this previous frame, and this at least one positional information comprises the coordinate information of this at least one block of pixels in this prior in frame and dimension information.
6. mirror image coding device as claimed in claim 4, it is characterized in that, when this diversity factor is higher than this predetermined threshold value, this image process unit adopts H.264 encoding mechanism to encode this present frame and the multiple temporary frame that is stored in this buffer, and this present frame after coding and the plurality of temporary frame are carried out multiplex (MUX) with corresponding audio-frequency unit and process to produce transmission stream, and send this transmission stream to this mirror image-decoding device by the serial flow passage of this direct line.
7. a mirror image decoding method, be suitable for the picture that mirror image-decoding device decoding mirror image coding device is shared, described method comprises the following steps:
The data from mirror image coding device are received from direct line;
Judge that these data are image processing channels from this direct line or serial flow passage;
If these data come from this image processing channels, at least one positional information according at least one difference block in these data and this at least one difference block adjusts present frame, wherein, this at least one positional information corresponds at least one difference block between this present frame and this previous frame; And
Control display unit and show this present frame.
8. method as claimed in claim 7, it is characterized in that, this at least one difference block comprises at least one block of pixels different between this present frame and this previous frame, and this at least one positional information comprises the coordinate information of this at least one block of pixels in this prior in frame and dimension information.
9. method as claimed in claim 7, is characterized in that, judge these data be from this image processing channels of this direct line or the step of this serial flow passage after, more comprise:
If these data come from this serial flow passage, collect the multiple frames that can be used for the mechanism of H.264 decoding, and the plurality of frame comprises this present frame;
Adopt this plurality of frame of mechanism decoding of H.264 decoding; And
Control the decoded the plurality of frame of this display unit display.
10. a mirror image-decoding device, comprising:
Communication unit, is configured to receive data from mirror image coding device from direct line;
Image process unit, connects this communication unit and this display unit, is configured to perform the following step:
Judge that these data are image processing channels from this direct line or serial flow passage;
If these data come from this image processing channels, at least one positional information according at least one difference block in these data and this at least one difference block adjusts present frame, and wherein this at least one positional information corresponds at least one difference block between this present frame and this previous frame; And
Control display unit and show this present frame.
11. mirror image-decoding devices as claimed in claim 10, it is characterized in that, this at least one difference block comprises at least one block of pixels different between this present frame and this previous frame, and this at least one positional information comprises the coordinate information of this at least one block of pixels in this prior in frame and dimension information.
12. mirror image-decoding devices as claimed in claim 10, it is characterized in that, more comprise the buffer being connected to this communication unit and this image process unit, if wherein these data come from this serial flow passage, this image process unit is more configured to:
From this buffer, collect the multiple frames that can be used for the mechanism of H.264 decoding, and the plurality of frame comprises this present frame;
Adopt this plurality of frame of mechanism decoding of H.264 decoding; And
Control the decoded the plurality of frame of this display unit display.
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